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CVE-2025-23131— dlm: prevent NPD when writing a positive value to event_done

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dlm处理event_done正值时可能导致空指针解引用。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 8511a2728ab82cab398e39d019f5cf1246021c1c< a1c41aebb184d9228a440dcb6761224e65b0e49a affected
8511a2728ab82cab398e39d019f5cf1246021c1c< ee28d99d789b077565cbe0377374d1e826c64d93 affected
8511a2728ab82cab398e39d019f5cf1246021c1c< c7837e2c96559663c33f43da403d9cf3cf77cfa7 affected
8511a2728ab82cab398e39d019f5cf1246021c1c< 7109d69bec6edce546dc870e66bd2b668a3d5549 affected
8511a2728ab82cab398e39d019f5cf1246021c1c< 10b7a59814765d18d43555c9cef4eb3048b7e8a3 affected
8511a2728ab82cab398e39d019f5cf1246021c1c< b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c affected
8511a2728ab82cab398e39d019f5cf1246021c1c< 8e2bad543eca5c25cd02cbc63d72557934d45f13 affected
2.6.31 affected
… +8 more rows
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I. Basic Information for CVE-2025-23131

Vulnerability Information
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Vulnerability Title
dlm: prevent NPD when writing a positive value to event_done
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dlm处理event_done正值时可能导致空指针解引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8511a2728ab82cab398e39d019f5cf1246021c1c ~ a1c41aebb184d9228a440dcb6761224e65b0e49a -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2025-23131

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III. Intelligence Information for CVE-2025-23131

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Patches & Fixes for CVE-2025-23131 (3)

Other References for CVE-2025-23131 (2)

Same Patch Batch · Linux · 2025-04-16 · 127 CVEs total

CVE-2025-22021 10.0 CRITICAL netfilter: socket: Lookup orig tuple for IPv6 SNAT
CVE-2025-22077 9.8 CRITICAL Revert "smb: client: fix TCP timers deadlock after rmmod"
CVE-2025-22110 9.8 CRITICAL netfilter: nfnetlink_queue: Initialize ctx to avoid memory allocation error
CVE-2025-22088 9.8 CRITICAL RDMA/erdma: Prevent use-after-free in erdma_accept_newconn()
CVE-2025-22040 8.8 HIGH ksmbd: fix session use-after-free in multichannel connection
CVE-2025-22074 8.8 HIGH ksmbd: fix r_count dec/increment mismatch
CVE-2025-23133 8.8 HIGH wifi: ath11k: update channel list in reg notifier instead reg worker
CVE-2025-22086 8.8 HIGH RDMA/mlx5: Fix mlx5_poll_one() cur_qp update flow
CVE-2024-58096 8.8 HIGH wifi: ath11k: add srng->lock for ath11k_hal_srng_* in monitor mode
CVE-2025-22039 8.8 HIGH ksmbd: fix overflow in dacloffset bounds check
CVE-2025-22041 8.8 HIGH ksmbd: fix use-after-free in ksmbd_sessions_deregister()
CVE-2025-22118 8.8 HIGH ice: validate queue quanta parameters to prevent OOB access
CVE-2025-22117 8.7 HIGH ice: fix using untrusted value of pkt_len in ice_vc_fdir_parse_raw()
CVE-2025-22108 8.6 HIGH bnxt_en: Mask the bd_cnt field in the TX BD properly
CVE-2025-22080 8.4 HIGH fs/ntfs3: Prevent integer overflow in hdr_first_de()
CVE-2025-22121 8.4 HIGH ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()
CVE-2025-22038 8.3 HIGH ksmbd: validate zero num_subauth before sub_auth is accessed
CVE-2025-22042 8.1 HIGH ksmbd: add bounds check for create lease context
CVE-2025-22043 8.1 HIGH ksmbd: add bounds check for durable handle context
CVE-2025-22047 7.8 HIGH x86/microcode/AMD: Fix __apply_microcode_amd()'s return value

Showing top 20 of 127 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-23131

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